I don't think the Corn Maidens want the Stars Above into the Lands Below; they say they want the sun. And all the SA say is "hold open the door," not keep them open.
While "take a life" is certainly open to interpretation, "weaken someone so another person can kill them" is stretching things, IMO. Your interpretation of "lose everything you love" is slightly more plausible but still stretching it.
All that said, the concept of the series ending with the gate to the Lands Below/Lands Beyond is certainly intriguing. It's certainly been implied that the main function of the Deathly Regiment is to keep them closed. But of course, that raises the issues of the monsters from the Lands Below invading the Lands Above...
Re: Where do we go from here? Hints in AQATSA
While "take a life" is certainly open to interpretation, "weaken someone so another person can kill them" is stretching things, IMO. Your interpretation of "lose everything you love" is slightly more plausible but still stretching it.
All that said, the concept of the series ending with the gate to the Lands Below/Lands Beyond is certainly intriguing. It's certainly been implied that the main function of the Deathly Regiment is to keep them closed. But of course, that raises the issues of the monsters from the Lands Below invading the Lands Above...